John Lewis leads Bloody Sunday march at Edmund Pettus Bridge

SNCC chairman John Lewis led 600 marchers across the Edmund Pettus Bridge in Selma, Alabama on March 7, 1965, where state troopers attacked them with clubs and tear gas in an event broadcast nationwide and known as Bloody Sunday. The images of Lewis's fractured skull and beaten marchers shocked the nation and directly led to President Johnson introducing the Voting Rights Act of 1965.